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            "questionId": "1724",
            "questionFrontendId": "1581",
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            "title": "Customer Who Visited but Did Not Make Any Transactions",
            "titleSlug": "customer-who-visited-but-did-not-make-any-transactions",
            "content": "<p>Table: <code>Visits</code></p>\n\n<pre>\n+-------------+---------+\n| Column Name | Type    |\n+-------------+---------+\n| visit_id    | int     |\n| customer_id | int     |\n+-------------+---------+\nvisit_id is the primary key for this table.\nThis table contains information about the customers who visited the mall.\n</pre>\n\n<p>&nbsp;</p>\n\n<p>Table: <code>Transactions</code></p>\n\n<pre>\n+----------------+---------+\n| Column Name    | Type    |\n+----------------+---------+\n| transaction_id | int     |\n| visit_id       | int     |\n| amount         | int     |\n+----------------+---------+\ntransaction_id is the primary key for this table.\nThis table contains information about the transactions made during the visit_id.\n</pre>\n\n<p>&nbsp;</p>\n\n<p>Write an SQL query to find the IDs of the users who visited without making any transactions and the number of times they made these types of visits.</p>\n\n<p>Return the result table sorted in <strong>any order</strong>.</p>\n\n<p>The query result format is in the following example.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> \nVisits\n+----------+-------------+\n| visit_id | customer_id |\n+----------+-------------+\n| 1        | 23          |\n| 2        | 9           |\n| 4        | 30          |\n| 5        | 54          |\n| 6        | 96          |\n| 7        | 54          |\n| 8        | 54          |\n+----------+-------------+\nTransactions\n+----------------+----------+--------+\n| transaction_id | visit_id | amount |\n+----------------+----------+--------+\n| 2              | 5        | 310    |\n| 3              | 5        | 300    |\n| 9              | 5        | 200    |\n| 12             | 1        | 910    |\n| 13             | 2        | 970    |\n+----------------+----------+--------+\n<strong>Output:</strong> \n+-------------+----------------+\n| customer_id | count_no_trans |\n+-------------+----------------+\n| 54          | 2              |\n| 30          | 1              |\n| 96          | 1              |\n+-------------+----------------+\n<strong>Explanation:</strong> \nCustomer with id = 23 visited the mall once and made one transaction during the visit with id = 12.\nCustomer with id = 9 visited the mall once and made one transaction during the visit with id = 13.\nCustomer with id = 30 visited the mall once and did not make any transactions.\nCustomer with id = 54 visited the mall three times. During 2 visits they did not make any transactions, and during one visit they made 3 transactions.\nCustomer with id = 96 visited the mall once and did not make any transactions.\nAs we can see, users with IDs 30 and 96 visited the mall one time without making any transactions. Also, user 54 visited the mall twice and did not make any transactions.\n</pre>\n",
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            "difficulty": "Easy",
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            "similarQuestions": "[{\"title\": \"Sellers With No Sales\", \"titleSlug\": \"sellers-with-no-sales\", \"difficulty\": \"Easy\", \"translatedTitle\": null}]",
            "exampleTestcases": "{\"headers\":{\"Visits\":[\"visit_id\",\"customer_id\"],\"Transactions\":[\"transaction_id\",\"visit_id\",\"amount\"]},\"rows\":{\"Visits\":[[1,23],[2,9],[4,30],[5,54],[6,96],[7,54],[8,54]],\"Transactions\":[[2,5,310],[3,5,300],[9,5,200],[12,1,910],[13,2,970]]}}",
            "categoryTitle": "Database",
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            "codeSnippets": [
                {
                    "lang": "MySQL",
                    "langSlug": "mysql",
                    "code": "# Write your MySQL query statement below\n",
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                    "lang": "MS SQL Server",
                    "langSlug": "mssql",
                    "code": "/* Write your T-SQL query statement below */\n",
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                {
                    "lang": "Oracle",
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                    "code": "/* Write your PL/SQL query statement below */\n",
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            "sampleTestCase": "{\"headers\":{\"Visits\":[\"visit_id\",\"customer_id\"],\"Transactions\":[\"transaction_id\",\"visit_id\",\"amount\"]},\"rows\":{\"Visits\":[[1,23],[2,9],[4,30],[5,54],[6,96],[7,54],[8,54]],\"Transactions\":[[2,5,310],[3,5,300],[9,5,200],[12,1,910],[13,2,970]]}}",
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            "mysqlSchemas": [
                "Create table If Not Exists Visits(visit_id int, customer_id int)",
                "Create table If Not Exists Transactions(transaction_id int, visit_id int, amount int)",
                "Truncate table Visits",
                "insert into Visits (visit_id, customer_id) values ('1', '23')",
                "insert into Visits (visit_id, customer_id) values ('2', '9')",
                "insert into Visits (visit_id, customer_id) values ('4', '30')",
                "insert into Visits (visit_id, customer_id) values ('5', '54')",
                "insert into Visits (visit_id, customer_id) values ('6', '96')",
                "insert into Visits (visit_id, customer_id) values ('7', '54')",
                "insert into Visits (visit_id, customer_id) values ('8', '54')",
                "Truncate table Transactions",
                "insert into Transactions (transaction_id, visit_id, amount) values ('2', '5', '310')",
                "insert into Transactions (transaction_id, visit_id, amount) values ('3', '5', '300')",
                "insert into Transactions (transaction_id, visit_id, amount) values ('9', '5', '200')",
                "insert into Transactions (transaction_id, visit_id, amount) values ('12', '1', '910')",
                "insert into Transactions (transaction_id, visit_id, amount) values ('13', '2', '970')"
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